Russian here. I've never heard this phrase in my life before. Maybe it's local, but definitely not common.

A relative new saying in German.

Person A: Where is the bus?

Person B: which bus?

A: Of people who asked?!

As native Russian speaker, this is terribly rarely used in this full format (and it's one among many), but genuine, I've heard it IRL.

"Тебя не ебёт, так не подмахивай"

This is highly and universally derogatory, you could expect to hear it from lowlife/criminal, which, unfortunately, is what most russians are lately, though. For russian nazi population, this implies that you are gay or a slut, depending on biological sex, and that's close to your life worth nothing. For the rest, this is just something nazies would say to insult you.

The first part alone, though, is quite socially acceptable and overused. I guess, because it's lost the whole lore behind it, and showing your knowledge of whence it came from kind of reveals that it's not just an empty word, but you mean it.

I'm a bit hyperfocused on swearing, am I? Was one of my childhood's special interests.

Honestly, "mind your beeswax" is also a rare gem, but not quite so rare.

I'm from Ukraine but Russian is my native language.

No, it isn't so. Doesn't even look like a very bad translation. Just no.

I guess 'Nobody asked you' isn't English?

As an Arabic speaker I have never heard of number 3, though Arabic is more like forty languages in a trench coat so that's not saying much.

In Denmark, the youngsters have recently been saying "spurgt?" which translates to "asked?" - as in "were you asked?". Somehow the brevity and linguistic lazyness makes it even more infuriating.

Depends on the region. In my native it was popular to say ебало завали, which loosely translates into "collapse your mouth" where mouth is used in a sense where it's an organ for penetration during sex.

In Vienna, we say "oida waunst laung deppat bist daun hauri da a watschn owe dass da viatzehn dog da schädl wogglt!"and I think that’s beautiful.

German: That's not your beer./ That concerns you like damp dirt./ That can walk by your ass.

I've always been partial to "This is an A -- B conversation, so C your way out."

Apparently the Argentine equivalent is something like “take your hat off, you’re not in this photo”

In Taiwan it's “關你屁事“

Which is mildly translated to "Care about your fart situation"

This is pretty derogatory. I wouldn't use it unless it's with your friends messing around.

Explanation for the french one : onion is an old slang for anus. So "mind your own onions" is an old-fashioned way to say "mind your own ass"

I will wiggle by ass on the camel & make signals with my candle whilst lubricating my onions with beeswax for you to fuck as I please, ok?!?!!

First time seeing this. Much more common one is "тебя ебать не должно" or a version without swearing: "не суй свой нос в чужие дела*

That's not a common British expression, at least, perhaps someone says it.

In English it’s: Nobody asked you!

English also has, "stay in your lane."

(Ireland) Wind yer neck in

The Scouse British dialect has a nice term for this: "Geg out". As opposed to "Fred is gegging in", used when someone is trying to implicate themselves or become part of the group/conversation.
Someone involving themselves when they shouldn't be? Two syllables: Geg. Out.
No idea where it comes from but I heard it a lot in my youth. Forsomereason.